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- K-Dur
- K-Lyte
- Kaletra
- Kaltostat Alginate Dressing
- Kalydeco
- Kaopectate
- Kariva
- Karvol Plus
- Kayexalate
- Kazano
- Keflex
- Kefzol
- Kemadrin
- Kenalog Cream
- Kenalog in Orabase
- Kenalog Lotion
- Kenalog Spray
- Kenalog-10
- Kenalog-40
- Keppra
- Keppra Oral Solution
- Keppra XR
- Kerendia
- Kerlone
- Kerydin
- Ketek
- Ketostix Strips
- Keytruda
- Kisqali
- Klisyri
- Klor Con Powder
- Klor-Con
- Klor-Con Effervescent
- Klor-Con M10
- Klor-Con M20
- Koena
- Kogenate FS
- Kombiglyze XR
- Kwellada-P Cream Rinse
- Kwellada-P Lotion
- Kyleena
- Kytril